Hunt for the Giant Leech

By Peter Tyson

Posted 07.01.08

NOVA scienceNOW

Imagine you're about to join leech expert Mark Siddall on a field search for the giant Amazonian leech. As he leads you knee-deep into the leech's swampy tropical habitat, you consider what you'd urgently like to know about the near-mythic creature he's seeking. For starters, how big? Well, it's the world's largest bloodsucking leech, growing up to a foot and a half long. Any other questions?

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